'use strict'
const path = require('path')
// const CompressionPlugin = require('compression-webpack-plugin')
// const productionGzipExtensions = /\.(js|css|json|txt|ico|svg)(\?.*)?$/i
function resolve(dir) {
  return path.join(__dirname, dir)
}
const cdn = {
  externals: {
    vue: 'Vue',
    'vue-router': 'VueRouter',
    'element-ui': 'ElementUI',
    'axios': 'axios'
  },
  css: [
    'https://file.528btc.com.cn/web/css/elementui.css'],
  js: [
    'https://file.528btc.com.cn/web/js/vue.min.js',
    'https://file.528btc.com.cn/web/js/vue-router.js',
    'https://file.528btc.com.cn/web/js/axios.min.js',
    'https://file.528btc.com.cn/web/js/elementui.js'
  ]
}
module.exports = {
    publicPath: './',
    configureWebpack: {
        resolve: {
          fallback: {
            path: require.resolve('path-browserify'),
          },
        },
    },
    devServer: {
      port: 3000, // 端口
      https: true,
      client: {
        overlay: false // 编译错误时，取消全屏覆盖（建议关掉）
      },
    },
    configureWebpack: config => {
      config.externals = cdn.externals
    },
    chainWebpack(config) {
      config.entry.app = ['babel-polyfill', './src/main.js']
      if (process.env.use_analyzer) {
        config
          .plugin('webpack-bundle-analyzer')
          .use(require('webpack-bundle-analyzer').BundleAnalyzerPlugin)
          .end()
      }
      config.plugins.delete('preload') // TODO: need test
      config.plugins.delete('prefetch') // TODO: need test
      // set svg-sprite-loader
      config.module
        .rule('svg')
        .exclude.add(resolve('src/icons'))
        .end()
      config.module
        .rule('icons')
        .test(/\.svg$/)
        .include.add(resolve('src/icons'))
        .end()
        .use('svg-sprite-loader')
        .loader('svg-sprite-loader')
        .options({
          symbolId: 'icon-[name]'
        })
        .end()
  
      // set preserveWhitespace
      config.module
        .rule('vue')
        .use('vue-loader')
        .loader('vue-loader')
        .tap(options => {
          options.compilerOptions.preserveWhitespace = true
          return options
        })
        .end()
  
      config
        // https://webpack.js.org/configuration/devtool/#development
        .when(process.env.NODE_ENV === 'development',
          config => config.devtool('cheap-source-map')
        )
  
      config
        .when(process.env.NODE_ENV !== 'development',
          config => {
            config
              .plugin('ScriptExtHtmlWebpackPlugin')
              .after('html')
              .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
                inline: /runtime\..*\.js$/
              }])
              .end()
            config
              .optimization.splitChunks({
                chunks: 'all',
                cacheGroups: {
                  libs: {
                    name: 'chunk-libs',
                    test: /[\\/]node_modules[\\/]/,
                    priority: 10,
                    chunks: 'initial' // only package third parties that are initially dependent
                  },
                  elementUI: {
                    name: 'chunk-elementUI', // split elementUI into a single package
                    priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                    test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                  },
                  commons: {
                    name: 'chunk-commons',
                    test: resolve('src/components'), // can customize your rules
                    minChunks: 3, //  minimum common number
                    priority: 5,
                    reuseExistingChunk: true
                  }
                }
              })
            config.optimization.runtimeChunk('single')
          }
        )
      config.plugin('html').tap(args => {
        args[0].cdn = cdn
        return args
      })
      // config.plugin('compressionPlugin').use(
      //   new CompressionPlugin({
      //     filename: '[path].gz[query]',
      //     algorithm: 'gzip',
      //     test: productionGzipExtensions,
      //     threshold: 10240,
      //     minRatio: 0.8
      //     // deleteOriginalAssets: true
      //   })
      // )
    }
}
